/**
 * File-based fallback key storage.
 *
 * Stores the master key in `.aegis/.master-key` with mode 0600.
 * Used for headless/CI environments where no OS keychain is available.
 *
 * Note: `.aegis/.unseal-key` is reserved for SealManager (Shamir
 * reconstructed key). This file uses a distinct name to avoid collision.
 */
import type { KeyStorage, KeyStorageBackend } from './key-storage.js';
export declare class FileFallbackStorage implements KeyStorage {
    readonly name = "File";
    readonly backend: KeyStorageBackend;
    private readonly keyPath;
    constructor(dataDir: string);
    isAvailable(): boolean;
    getKey(): string | undefined;
    setKey(key: string): void;
    deleteKey(): void;
}
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